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Manabe, Kentaro; Takahashi, Fumiaki
no journal, ,
The Atomic Energy Agency has developed a code for internal dose calculation as a fundamental technology for introduction of the 2007 Recommendations of the International Commission on Radiological Protection into the regulatory standards for internal exposure. The code provides two functions: calculation of committed effective doses for unit intake of radionuclides and estimation of intakes of radionuclides from individual monitoring data. The two functions are integrated by a graphical user interface. We will introduce an overview of the code, the status of implementation of biokinetic models published in April 2022, and a plan of integration of radiation absorption data based on the physique of reference Asian.
Misono, Toshiharu; Funaki, Hironori; Nakanishi, Takahiro; Tsuruta, Tadahiko; Shiribiki, Takehiko; Sanada, Yukihisa
no journal, ,
Typhoon Hagibis (on 11-12 October 2019) and the subsequent typhoon Bualoi (on 24-25 October 2019) caused considerable flood damage in Fukushima region. The Ukedo River has a catchment with a high 
Cs inventory due to the FDNPP accident. Thus, there was concern about re-contamination of the seabed sediment in the coastal area due to the deposition of particulate Cs discharged from river. The results showed that the Cs concentration in the seabed sediment two years after the large-scale discharge was higher than that before the river flood. We plan to clarify the details of the mechanism through continuous monitoring.
Sato, Rina; Yoshimura, Kazuya; Abe, Tomohisa; Funaki, Hironori; Mori, Airi; Sanada, Yukihisa; Mori, Tsubasa*; Sato, Tetsuro*
no journal, ,
Ochi, Kotaro; Abe, Tomohisa; Sasaki, Miyuki; Sato, Rina; Yoshimura, Kazuya; Sanada, Yukihisa
no journal, ,
It is difficult to calculate radiocesium inventories in forests, which cover approximately 60% of the land in Fukushima Prefecture. Conversion coefficients (ADCs) are available for estimating radiocesium inventories from air dose rates, but they are supposed to be applied to flat land, and there are no examples of their validation in forests. In this study, surveys were conducted over a wide area in 2011-2021 and a narrow area in 2019 in both virgin lands and forests. Air dose rates, relaxation mass depth (
), and soil radiocesium inventories were obtained at the same locations. ADCs were calculated based on . The estimated radiocesium inventories and soil radiocesium inventories were not significantly different for both land uses, and this was true for both the wide- and narrow-area surveys. Therefore, it is considered that radiocesium inventories can be easily estimated from air dose rates using ADCs even in forests when sufficient time has passed since the accident.
Abe, Tomohisa; Funaki, Hironori; Yoshimura, Kazuya; Sato, Rina; Sasaki, Miyuki
no journal, ,
Yoshitomi, Hiroshi; Tsuji, Tomoya; Fukami, Tomoyo; Nishino, Sho; Tanimura, Yoshihiko
no journal, ,
no abstracts in English
Yoshitomi, Hiroshi; Tsuji, Tomoya; Fukami, Tomoyo; Nishino, Sho; Takamine, Jun; Murayama, Takashi; Tanimura, Yoshihiko
no journal, ,
no abstracts in English
Kowatari, Munehiko*; Yoshitomi, Hiroshi; Tanimura, Yoshihiko; Kurihara, Osamu*
no journal, ,
no abstracts in English
Nagao, Fumiya; Kurikami, Hiroshi; Ochi, Kotaro; Yoshimura, Kazuya; Sanada, Yukihisa
no journal, ,
Japan Atomic Energy Agency regularly collects and publishes via an online database environmental monitoring data related to the FDNPP. JAEA has provided collected data in our website (https://emdb.jaea.go.jp/emdb/). JAEA upgraded the website to have dynamic system based on web application and background relational database system. Users can view data on the geographical map or graph, also download data to use own purpose.